Weather Forecast

Hawaii County Weather Forecast for July 17, 2022

July 17, 2022, 7:16 AM HST
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Hilo

Today: Breezy. Partly sunny with scattered showers. Highs around 83 near the shore to around 71 at 4000 feet. Northeast winds 10 to 20 mph. Chance of rain 40 percent.

Tonight: Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows around 70 near the shore to around 56 at 4000 feet. North winds up to 15 mph. Chance of rain 40 percent.

Monday: Partly sunny in the morning then becoming mostly sunny. Breezy. Scattered showers. Highs around 83 near the shore to 68 to 73 at 4000 feet. Northeast winds 10 to 20 mph. Chance of rain 40 percent.

Kona

Today: Sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs around 87 near the shore to 70 to 76 near 5000 feet. West winds 10 to 15 mph. Chance of rain 20 percent.

Tonight: Mostly cloudy in the evening then becoming mostly clear. Isolated showers. Lows 72 to 77 near the shore to around 57 near 5000 feet. Northeast winds up to 10 mph in the evening becoming light. Chance of rain 20 percent.

ARTICLE CONTINUES BELOW AD

Monday: Mostly sunny. Isolated showers in the afternoon. Highs around 86 near the shore to 69 to 75 near 5000 feet. Light winds becoming northwest around 10 mph in the afternoon. Chance of rain 20 percent.

Waimea

ARTICLE CONTINUES BELOW AD

Today: Partly sunny. Windy. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 82 near the shore to 72 to 80 near 3000 feet. East winds 10 to 30 mph. Chance of rain 40 percent.

Tonight: Breezy. Partly cloudy with scattered showers. Lows around 70 near the shore to 58 to 65 near 3000 feet. East winds 10 to 25 mph with gusts to 45 mph. Chance of rain 40 percent.

Monday: Partly sunny in the morning then becoming mostly sunny. Breezy. Scattered showers. Highs around 82 near the shore to 72 to 79 near 3000 feet. East winds 15 to 20 mph. Chance of rain 40 percent.

Kohala

ARTICLE CONTINUES BELOW AD

Today: Partly sunny. Windy. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 82 near the shore to 72 to 80 near 3000 feet. East winds 10 to 30 mph. Chance of rain 40 percent.

Tonight: Breezy. Partly cloudy with scattered showers. Lows around 70 near the shore to 58 to 65 near 3000 feet. East winds 10 to 25 mph with gusts to 45 mph. Chance of rain 40 percent.

Monday: Partly sunny in the morning then becoming mostly sunny. Breezy. Scattered showers. Highs around 82 near the shore to 72 to 79 near 3000 feet. East winds 15 to 20 mph. Chance of rain 40 percent.

South Big Island

Today: Mostly sunny. Windy. Highs around 85 near the shore to around 76 near 5000 feet. East winds 10 to 30 mph.

Tonight: Partly cloudy. Breezy. Lows around 73 near the shore to around 56 near 5000 feet. Northeast winds 10 to 25 mph.

Monday: Sunny and breezy. Highs around 84 near the shore to around 75 near 5000 feet. East winds 10 to 20 mph.

Puna

Today: Breezy. Partly sunny with scattered showers. Highs around 83 near the shore to around 71 at 4000 feet. Northeast winds 10 to 20 mph. Chance of rain 40 percent.

Tonight: Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows around 70 near the shore to around 56 at 4000 feet. North winds up to 15 mph. Chance of rain 40 percent.

Monday: Partly sunny in the morning then becoming mostly sunny. Breezy. Scattered showers. Highs around 83 near the shore to 68 to 73 at 4000 feet. Northeast winds 10 to 20 mph. Chance of rain 40 percent.

Waikoloa

Today: Sunny and breezy. Highs around 86 near the shore to 70 to 75 above 4000 feet. North winds 10 to 20 mph.

Tonight: Mostly clear. Breezy. Lows around 75 near the shore to 53 to 61 above 4000 feet. Southeast winds up to 20 mph.

Monday: Sunny. Highs around 85 near the shore to 69 to 74 above 4000 feet. North winds up to 15 mph increasing to 10 to 15 mph in the afternoon.

Detailed Forecast

Synopsis

A surface high pressure system located far north of the Aloha State will maintain strong and gusty trade winds today. A drier than normal, breezy trade wind weather pattern is expected from tonight through Tuesday. A return to a more typical trade wind weather pattern with windward focused showers is expected starting around mid-week. Finally, a very large south swell will continue to produce dangerous breaking waves and localized inundation of some low-lying sections of the south facing shores of all islands into Monday.

Discussion

A 1031 mb surface high pressure system remains anchored near 39N 157W, or about 1170 miles north of Lihue. Elsewhere, the remnant surface trough, which was former Tropical Cyclone Darby is now evident more than 200 miles south-southwest of Lihue. This feature is moving westward at about 20 mph. The main Hawaiian Islands remain sandwiched in the very tight pressure gradient between the remnants of Darby and the surface high. This is producing strong trade winds across most of the state early this morning. Winds over land are expected to remain below the Wind Advisory criteria today. The winds on the Summit of Mount Haleakala continue to be strong, but they have dropped well below the Wind Advisory threshold for the higher elevations this morning.
Satellite imagery shows a large area of broken stable stratocumulus clouds filtering in toward the islands from the east-northeast. This is an indication of the drier conditions that are becoming established across the region as the residual moisture associated with former Tropical Cyclone Darby are pushed west of the state. The forecast guidance shows that the drier trade wind weather pattern will likely continue through Tuesday. We are also expecting a gradual downward trend in trade wind speeds from tonight through Tuesday, but breezy conditions will likely persist. Note that the combination of persistent areas of drought, low daytime humidity values, and gusty trade winds may elevate fire weather concerns during the first half of the new work week. A return to a more typical trade wind weather pattern with windward and mauka showers is expected starting around mid- week. Once this weather pattern become established, it may persist through the end of the week.

Aviation

High pressure north of the state will keep breezy trade winds in place through tonight. Temporary MVFR cigs and isolated MVFR vsbys will be possible in showers across windward locales through mid morning, before drier conditions become established. Otherwise, VFR conditions should prevail during the next 24 hours.
AIRMET Sierra remains in effect for mountain obscuration over windward sections of most islands. Conditions will likely improve by mid morning.
AIRMET Tango remains in effect for low level turbulence over and downwind of the terrain of all islands. This AIRMET will remain in place through the day and possibly into tonight.

Marine

A surface trough in the far south- southwest offshore waters will continue to weaken below gale- force in the next couple of hours and move west of the area later today.
A strong, surface high pressure system will remain far north of the islands. The gradient between the high and the trough mentioned above will continue to produce strong to localized near gale force winds today, then weaken slightly to the fresh to locally strong speeds through much of next week. The Small Craft Advisory has been extended for all coastal waters through tonight due to the combination strong winds, and elevated seas from local wind waves and a large south swell.
A historic south swell is expected to peak today, producing Warning level surf into Monday. Thus, the High Surf Warning has been extended through Monday afternoon as this swell slowly subsides through much of next week. A Marine Weather Statement has been issued to account for the combination of large surf and regular predicted water levels that could lead to flooding of beaches that typically remain dry, and harbor surges, especially at and around the peak daily high tide.
The High Surf Advisory for east facing shores of the Big Island has been cancelled as the swells from Former Tropical Cyclone Darby have subsided. However, surf along all east facing shores will remain elevated and rough into much of next week due to strong persistent trades.

HFO Watches/Warnings/Advisories

High Surf Warning until 6 PM HST Monday for south facing shores of all Hawaiian Islands.
Small Craft Advisory until 6 AM HST Monday for all Hawaiian waters.

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Data Courtesy of NOAA.gov

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